#646771
Closest named color: Dim Gray (#696969). oklch(51.5% 0.016 272.5), rgb(100, 103, 113).
Aa
White text reads best on this color (5.64:1).
About this color
#646771 is a medium-dark close to neutral grey. In OKLCH its lightness is 51%, its chroma 0.016. It has too little chroma to lean warm or cool. The nearest named color is Dim Gray (#696969), ΔE 0.017 away. White text reads best on it, at 5.64:1.
| Hue family | Neutrals |
| Lightness | medium-dark (51%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Dim Gray (#696969) |
| Black text | 3.72:1 |
| White text | 5.64:1 |
Values
| HEX | #646771 |
| RGB | rgb(100, 103, 113) |
| HSL | hsl(226, 6%, 42%) |
| OKLCH | oklch(51.5% 0.016 272.5) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #646771 | 5.64:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #646771 | 3.72:1 | AA large text | Lc 25.8 | Dividers and decoration only |
| #646771 text on white | 5.64:1 | AA | Lc 78.3 | Fine for body text |
| #646771 text on black | 3.72:1 | AA large text | Lc -23.5 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#F5F5F6
oklch(97% 0.001 286.4)
-
Step 100
100
#E9EAEB
oklch(93.7% 0.002 247.8)
-
Step 200
200
#D8D9DC
oklch(88.5% 0.004 271.4)
-
Step 300
300
#BFC0C6
oklch(80.9% 0.008 278.6)
-
Step 400
400
#9EA0A9
oklch(70.7% 0.013 276)
-
Step 500
500
#868993
oklch(63.1% 0.015 272.6)
-
Step 600
600
#70737E
oklch(55.7% 0.017 273.7)
-
Step 700
700 (this color)
#646771
oklch(51.5% 0.016 272.5)
-
Step 800
800
#4C4F57
oklch(42.8% 0.014 269.4)
-
Step 900
900
#404147
oklch(37.7% 0.01 278.3)
-
Step 950
950
#25262A
oklch(26.9% 0.008 274.7)
#646771 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #646872 | 0.003 |
| Deuteranopia (no green cones) | #636771 | 0.002 |
| Tritanopia (no blue cones) | #61696A | 0.015 |
| Achromatopsia (no color) | #676767 | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646771
#646771
oklch(51.5% 0.016 272.5)
- #6B675D
#6B675D
oklch(51.4% 0.016 88.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #646771, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.017
- Slate #516572 ΔE 0.029
- Battleship Gray #6C757D ΔE 0.044
- Metallic Blue #4F738E ΔE 0.052
- Dusty Grape #545775 ΔE 0.058
- Battleship Grey #6B7C85 ΔE 0.063
- Dark Taupe #7F684E ΔE 0.066
- Grey Purple #826D8C ΔE 0.066
Use #646771 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.